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United States Patent | 5,121,931 |
Matsushita ,   et al. | June 16, 1992 |
A noncontact mechanical seal has a seal ring which includes a sealing face portion formed by ventilative porous materials and a ventilating portion to pass a gas of a high pressure side to the sealing face portion from the back side of said sealing face portion. The sealing face portion is preferably a porous ring independently formed of said seal ring and mounted on the seal ring providing a space at the back side thereof. The seal ring preferably is provided with a small diameter thin portion at the portion forming the bottom of the space.
Inventors: | Matsushita; Mitsuyoshi (Tokyo, JP); Matsumoto; Nobuhiro (Tokyo, JP) |
Assignee: | Tanken Seiko Kabushiki Kaisha (Tokyo, JP) |
Appl. No.: | 610351 |
Filed: | November 7, 1990 |
Dec 07, 1989[JP] | 1-318177 |
Current U.S. Class: | 277/400; 277/401; 277/404 |
Intern'l Class: | F16J 015/34; F16J 015/54 |
Field of Search: | 277/83,85,96,96.2,96.1,27,82,87,81 R |
2491233 | Dec., 1949 | Vedovell | 277/81. |
2884268 | Apr., 1959 | Amirault et al. | 277/83. |
2937039 | May., 1960 | Santapa | 277/81. |
3093382 | Jun., 1963 | Macks | 277/96. |
3389921 | Jun., 1968 | Lojkutz | 277/96. |
3462159 | Aug., 1969 | Baumann et al. | 277/83. |
3652183 | Mar., 1972 | Pottharst, Jr. | 277/96. |
4103907 | Aug., 1978 | Inouye et al. | 277/96. |
4165085 | Aug., 1979 | Persson | 277/96. |
4277072 | Jul., 1981 | Forch | 277/96. |
4291887 | Sep., 1981 | Etsion et al. | 277/27. |
4445695 | May., 1984 | Wilkinson | 277/96. |
4776598 | Oct., 1988 | Akema | 277/96. |
4799693 | Jan., 1989 | Johnston | 277/96. |
4997192 | Mar., 1991 | Nagai et al. | 277/96. |
Foreign Patent Documents | |||
543907 | Jan., 1956 | BE | 277/85. |